One vertex per element, one color per generator, with an edge from x to x·s.
(2,6)(3,4)(7,8)(10,14)(12,19)(15,21)(16,20)(18,23)(22,24)(25,26,31,28)(27,35,39,40)(29,34,30,33)(32,37,36,38)(3,4)(6,8)(9,10)(11,15)(12,20)(13,16)(14,19)(17,22)(18,24)(21,23)(25,27)(26,32)(28,36)(29,38)(30,37)(31,39)(33,35)(34,40) involution — undirected(1,2,5,7)(3,6,4,8)(9,11,13,17)(10,15,16,22)(12,18,19,23)(14,21,20,24)(25,28,31,26)(27,36,39,32)(29,33,30,34)(35,37,40,38)(1,3,5,4)(2,6,7,8)(10,16)(11,17)(14,20)(18,23)(25,29,31,30)(26,33,28,34)(27,37,39,38)(32,40,36,35)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.